When Captain Holt smashes through his office window it breaks into large shards like regular plate glass. Later, when he closes the blinds to talk to Charles Boyle, the window sill and the couch are covered in the small granular chunks typical of tempered safety glass.
Captain Holt wears his Commendation breast bar above his World Trade Center Breast Bar. When the WTC bar is worn, it is worn above all other medals, but below the American Flag bar.
Obvious stunt double when Gina skates into the pillar.
Jake first suspects the pizza delivery to be a ruse because, "Holt hates pizza." In Sal's Pizza (2013), it was revealed that Holt subscribes to Charles' email blast ranking Brooklyn pizza places (due to its information being more complete than any other ranking system, as it includes "mouth feel" in its ratings). He would not be subscribed to that email blast if he "hates pizza."